<script>
import { ref,watch,onUnmounted } from "vue";
export default {
  name: 'XtxCarousel',
  props: {
    sliders: {
        type: Array,
        default: ()=>[]
    },
    duration: {
        type: Number,
        default: 3000
    },
    autoPlay: {
        type: Boolean,
        default: false
    },
    activeColor: {
      type: String,
      default: '#fff'
    }
  },
  setup(props){
    const index = ref(0)
    let timer = null
    const autoPlayFn = ()=>{
        clearInterval(timer)
        timer = setInterval(()=>{
            index.value++
            if(index.value >= props.sliders.length) index.value = 0
        },props.duration)
    }
    watch(()=>props.sliders,(newVal)=>{
        if(newVal.length && props.autoPlay){
            index.value = 0
            autoPlayFn()
        }
    },{immediate: true})

    const stop = ()=>{
        if(timer) clearInterval(timer)
    }
    const start = ()=>{
        if(props.sliders.length && props.autoPlay){
            autoPlayFn()
        }
    }
    const toggle = (step)=>{
        const newIndex = index.value + step
        if(newIndex>=props.sliders.length){
            index.value = 0
            return
        }
        if(newIndex<0){
            index.value = props.sliders.length - 1
            return
        }
        index.value = newIndex
    }
    onUnmounted(() => {
      clearInterval(timer)
    })
    return {index,start,stop,toggle}
  }
}
</script>

<template>
    <div class='xtx-carousel' @mouseenter="stop()" @mouseleave="start()">
        <ul class="carousel-body">
          <li class="carousel-item" v-for="(item,i) in sliders" :key="i" :class="{fade:index===i}">
            <RouterLink v-if="item.hrefUrl" :to="item.hrefUrl">
              <img :src="item.imgUrl" alt="">
            </RouterLink>
            <div v-else class="slider">
              <RouterLink v-for="goods in item" :key="goods.id" :to="`/product/${goods.id}`">
                <img :src="goods.picture" alt="">
                <p class="name ellipsis">{{goods.name}}</p>
                <p class="price">&yen;{{goods.price}}</p>
              </RouterLink>
            </div>
          </li>
        </ul>
        <a href="javascript:;" class="carousel-btn prev" @click="toggle(-1)"><i class="iconfont icon-angle-left"></i></a>
        <a href="javascript:;" class="carousel-btn next" @click="toggle(1)"><i class="iconfont icon-angle-right"></i></a>
        <div class="carousel-indicator">
          <span v-for="(item,i) in sliders" :key="i" :class="{active:index===i}" :style="index===i?`background:${activeColor}`:null"></span>
        </div>
    </div>
</template>

<style scoped lang="less">
@import '@/assets/styles/variables.less';
.xtx-carousel{
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel{
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
      .slider {
        display: flex;
        justify-content: space-around;
        padding: 0 40px;
        > a {
          width: 240px;
          text-align: center;
          img {
            padding: 20px;
            width: 230px!important;
            height: 230px!important;
          }
          .name {
            font-size: 16px;
            color: #666;
            padding: 0 40px;
          }
          .price {
            font-size: 16px;
            color: @priceColor;
            margin-top: 15px;
          }
        }
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0,0,0,0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        // &.active {
        //   background:  #27ba9b;
        // }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0,0,0,.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev{
        left: 20px;
      }
      &.next{
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}


</style>